Replaced README with slightly edited 1.6 client README.
Added my signing key to download config.
Actually update AboutDialog
Merge branch '1.7-dev-readme' of github.com:rnicoll/dogecoin into rnicoll-1.7-dev-readme

Conflicts:
	README.md
Merge pull request #397 from rnicoll/1-7-dev-gitian

Add rnicoll key to download config